Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/17189
標題: 鎳鐵薄膜中微波感應電流之研究
Microwave-induced direct current in permalloy thin films
作者: 蕭丞原
Siao, Cheng-Yuan
關鍵字: coplanar waveguide
共平面波導
induced current
permalloy
感應電流
鎳鐵薄膜
出版社: 物理學系所
引用: [1] Nikolaos Tombros, Csaba Jozsa, Mihaita Popinciuc, Harry T. Jonkman & Bart J. van Wees,Nature 448 (2007). [2] J. C. Slonczewski, Phys. Rev. B 39, 6995 (1989). [3] A.N. Fedorova and M.G. Zeitlin, ’Wavelets in Optimization and Approximations’, Math. and Comp. in Simulation, 46,527(1998.) [4] W. Shubnikov, W.J. de Haas: Proc. Netherlands Roy. Acad. Sci. 33, 130 (1930) [5] E. B. Myers, D. C. Ralph, J. A. Katine, R. N. Louie,R. A. Buhrman, Science 285, 867 (1999). [6] D. Shoenberg: Magnetic Oscillations in Metals (Cambridge University Press, Cambridge, 1984) 171, 175, 182 [7]. G. Landwehr: “Quantum transport in silicon inversion layers”, in Advances in Solid State Physics, ed. by H.J. Queisser, Vol. 15 (Pergamon-Vieweg, Braunschweig, (1975) [8] M. A. Ruderman and C. Kittel, Phys. Rev. 96, 99(1954) [9] M. N. Vaibich, J. M. Broto, A. Fert, F. Nguyenvan Dau, F. Petroff, P. Etienne, G. Creuzet, A. Friederich and J. Chazelas, Phys. Rev. Lett. 61, 2472(1988) [10] C. P. Wen, IEEE Trans. Microwave Theory Tech. 17, 1087 (1969) [11]. T. Kasuya, Progr. Theoret. Phys. (Kyoto) 16, 45(1956) [12]S. I. Kiselev, J. C. Sankey, I. N. Krivorotov, N. C. Emley, R. J. Schoelkopf, R. A. Buhrman, and D. C. Ralph, Nature (London) 425, 380 (2003). [13]T. Moriyama, R. Cao, X. Fan, G. Xuan, B. K. Nikolic, Y. Tserkovnyak, J. Kolodzey, and J. Q. Xiao, Phys. Rev. Lett. 100, 067602 (2008) [14]S. M. Rezende, A. Azevedo, M. A. Lucena, and F. M. de Aguiar, Phys. Rev. B 63, 214418 (2001). [15]W.J. de Haas, P.M. van Alphen: Proc. Netherlands Roy. Acad. Sci. 33, 1106 (1930) 171 [16]A. A. Tulapurkar, Y. Suzuki, A. Fukushima, H. Kubota, H. Maehara, K. Tsunekawa, D. D. Djayaprawira, N. Watanabe, and S. Yuasa, Nature (London) 438, 339 (2005). [17]N. Mecking, Y. S. Gui, and C. M. Hu, Phys. Rev. B 76, 224430 (2007). [18]K. Beilenhoff, H. Klingbeil, W. Heinrich, and H. L. Hartnagel, IEEE Trans. Microwave Theory Tech. 41, 1534 (1993). [19]J. C. Sankey, P. M. Braganca, A. G. F. Garcia, I. N. Krivorotov, R. A. Buhrman, and D. C. Ralph, Phys. Rev. Lett. 96, 227601 (2006). [20]鄭振東,“實用磁性材料學“,全華科技出版社(1999) [21] Robert C.O’Handley, “Modern Magnetic Materials”, A Wisley Interscience Publication company (2000)
摘要: 本論文是研究鎳鐵薄膜(Ni80Fe20)受微波激發之直流電流與外加磁場變化的關係。樣品為共平面波導(coplanar waveguide,CPW),其中的訊號傳輸線(signal path)為厚度100 nm的鎳鐵薄膜,CPW訊號傳輸線的寬度為50 um。測量系統包含一支高頻的探測器(Probe),內有兩個T型偏置器(Bias-Tee),可以分開微波和直流電流訊號的路徑,脈衝調變的微波訊號經過Bias-Tee高頻輸入端進入樣品,其所激發的直流電流由Bias-Tee的直流端經過電流放大器後由鎖相放大器讀取。實驗結果顯示電流會隨磁場發生震盪的現象,樣品和磁場的角度對振幅很敏銳。在微波頻率小於3.2 GHz,增加微波的頻率會有感應電流振盪的位置會往高場移動,大於3.2 GHz感應的電流就有變小的驅勢;微波功率強度越強則零場的直流感應電流變大。
We study the microwave-induced DC currents of a permalloy (Ni80Fe20 ) thin film in magnetic fields. The device structure is mainly a coplanar waveguide (CPW), whose signal path is a 50 um wide, 100 nm thick permalloy thin film The pulse modulated microwave signal is fed into the sample through the high frequency port of bias-tees and the induced DC current is received from DC terminal thereof. The DC current is then amplified by a current preamplifier, and read out by lock-in technique. We found that the oscillation behavior is quite sensitive to the angle between the sample and the magnetic field. When the frequency (f) of the microwave signal increases, the magnetic oscillation of induced DC current is shifted to high field. As f being slightly larger than 3.2 GHz, the induced DC current suddenly decreases an order of the magnitude. We also studied the power dependence of the induced current on the microwave power.
URI: http://hdl.handle.net/11455/17189
其他識別: U0005-2708201010373200
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2708201010373200
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